On the current roster, I don't know. I like Tyson Kidd a lot and he seems to get a lot of grief.
But historically speaking from the very moment he came to WWF up to today that I get the most amount of grief for is Jeff Jarrett. Jarrett is my second favorite wrestler of all time after Ric Flair. I remember an old forum I used to post on and I can't tell you how many ad hominem attacks I got from posters like: "This coming from a guy with Jeff Jarrett on his avatar."
When I was in high school, my best friend Tim and I did everything wrestling. And he even teased me about being such a mark for Jarrett. I can't recall how many times Tim would bitch: "All he ever does is Irish whip his opponent into the ropes."
You want to read something nasty as hell? Read this article I wrote 9 years ago(
http://www.onlineworldofwrestling.com/columns/misc/jacobkuhn10.html) I was a reasonably popular wrestling columnist for this website and I wrote an extremely pro Jarrett column and I got lambasted in the comments section at the bottom. The amount of emails I received was more for this than anything else I ever wrote and not a single one was positive.
When I first came here, I had a Jarrett avatar and was waiting for someone to get on my case for it and no one did.
As far as why I like Jarrett so much, it's hard to know for sure. I have to admit the whole country singer gimmick was stupid. I was always a fan but I think I became a bigger fan through Owen Hart, who was also one of my favorite wrestlers ever. But whatever the reason, I like the guy and probably always will.